Annual report pursuant to Section 13 and 15(d)

Securitization of Receivables - Schedule of Fair Values of Retained Interests, Discount Rates Used in Valuing Interests (Parenthetical) (Detail)

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Securitization of Receivables - Schedule of Fair Values of Retained Interests, Discount Rates Used in Valuing Interests (Parenthetical) (Detail)
Dec. 31, 2013
Sep. 30, 2012
Servicing [Member]
   
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Change in discount rate 5.00% 5.00%
Change in discount rate 10.00% 10.00%
Residual Assets [Member]
   
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Change in discount rate 5.00% 5.00%
Change in discount rate 10.00% 10.00%